Name the five layers in the hierarchy of control measures used to manage diving hazards.

• A. Elimination, Substitution, Engineering controls, Administrative controls, Personal protective equipment.
• B. Risk avoidance, monitoring, training, supervision, documentation.
• C. Elimination, Isolation, Containment, Monitoring, PPE.
• D. Planning, Risk assessment, PPE, Training, Supervision.

Answer: (A)

The question tests the hierarchy of controls used to reduce diving hazards, from most effective to least: elimination, substitution, engineering controls, administrative controls, and personal protective equipment. Elimination means removing the hazard from the task entirely, so there is no exposure to it. Substitution involves replacing the hazard with a less dangerous alternative. If removing or replacing isn’t possible, engineering controls are put in place to physically prevent exposure or isolate the diver from the hazard—things like safer equipment design, redundancies, or barriers. If these still don’t fully protect, administrative controls rely on procedures, planning, training, supervision, permits, and scheduling to minimize risk. PPE is the last line of defense, worn by the diver to protect against residual risk when the other controls cannot eliminate it.

These five layers reflect a structured approach; other option sets mix in elements like monitoring, planning, or general risk activities that don’t align with the five-layer ladder. The strongest answer follows the clear sequence from removing hazards to protective gear, which is the standard framework used to manage diving hazards.